Speed-varying pulley.



No.-sa|,|44. Patented Aug. 2o. lem. F. w.sPAcKE.

SPEED vAnYma' PULLEY.

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No. 68|,|44. Patented Aug. 20, I90I.

r. w. sPAcKE. SPEED vAYms PuLLEv.

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N o. 68|,|44. Patented Aug. 20, |901.

F. W. SPACKE.

SPEED VARYING PULLEY.

(Application tiled Oct. 19, 1900.)

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UNITED STATES PATENT OFFICE.

FRED YV. SPAOKE, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO SPEED CHANGING PULLEY COMPANY, OF SAME PLACE.

SPEEDNARYING P'ULLEY.

SPECIFICATION forming' part of Letters Patent N0. 681,144, dated August 20, 1901. lippnoooioo noa ooioooo 19, iooo. serai No. 83.654. (No motor.)

To if/ZZ whom t may concern:

Beit known that I, FRED W. SPACKE, a citi` zen of the United States, residing at Indianapolis, in the county of Marion and State of speed-varying mechanisms.

In the use of centrifugal governors, especially such` as those for tractionengines and i y engines used` for driving farm machinery, it i is necessaryto varythe normal speed of the `pengine, according` to the particular class of `work which is at `the time being done.

For instance, when aytraction-engine is running on the road a higher speed can be used, and fj i when used in driving threshing machinery the speed of the engine should .be varied in aco `cordance with the condition andlcharacter of y the grain. i for the engineer to vary the strength of the i l tension-spring which is used on governors Vof i this` class to act upon the valve-stem. Gov-` It has been heretofore customary i o I ernors'provided with springs of this character are so proportioned that the best regulation of the valve is had when the tension-spring is a. in its normal medial condition. If this spring l be too tight, the action of the governor- 1 balls upon the valve is heavy and slow, while .a if the spring be too weak the action is jerky l anduncertain.

The unusual adjustment of f the tension-spring results, therefore, in an impairment of the efficiency of the governor.

The object of my invention is, therefore, to

" produce a small and compact speed-varying l `3 mechanism `which is self-contained and has a y the general form of a pulley, which mechangismlmay be substituted for the usual pulley 40 `centrifugal governor.

used u pon the drivingshaft of any ordinary The accompanying drawings illustrate my l invention. f

a so

` Figure 1 is a side elevation showing my improvedlpulley` attached to a governor. Fig. Fig. 3 is a plan with one tion, aboutfull size. i

`In thedrawings, 5 indicates a disk provided on one `surface with` an annular groove 6,

`nection between the two disks.

. substantially semicircular in cross-section.

Formed integral with disk 5 is a sleeve 7, threaded at its outer end and provided with an axial bore for the reception of the driven shaft 8, said shaft `being in Fig. 1 the usual 55 drivin g-shaft of the governor 9. Cooperating with disk 5 is a disk 10, which is provided on that face adjacent disk 5 with an annular groove 11, which is similar to and registers with groove 6. Formed integral with or secured to disk l0 is a driving-pulley l2,adapted to receive the belt ordinarily used for driving the governor. Disk is provided with a central hub llt, which is bored to receive sleeve 7 of disk 5. The pulley 12 is hollow, so as to form with sleeve 7 an annular chamber 13 for the reception of spring 15, one end of which engages disk 10 andthe other end ofwhich is engaged by a collar 16,1ongitudinally movable upon sleeve 7 and provided with pins 17, adapted to engage hub 14, so as to prevent any relative rotating movement between said collar and hub. Ooperating with collar 16 is a collar 1S, longitudinally adjustable upon sleeve 7 by means ofa nut 19. The two collars 16 and 18 are provided upon their adja- Icent faces with ball-races adapted to receive balls 20, thus forming a thrust-bearing con- Disk 10 is provided on its groove-face with 8o a hollow projecting hub 21, upon which is loosely fitted the hub 22 of a spider consisting of two pairs of oppositely-extending arms 23 and 23. Each of arms 23 is provided at its outer end with a bearing 24o, the two bearings alining upon a line at right angles to shaft 8. Mounted between bearings 24o is a yoke 25, within which is mounted a frictionwheel 26, the axis 27 of which lies at right angles to the axis of the yoke. Arms 23' are provided with bearings 24J, between which is mounted a yoke 25', carrying a friction-wheel 26', whose axis 27' is at right angles to the axis of vyoke 25.

Secured to yoke 25 is a segmental gear 28, 95 which meshes with a similar gear 28', secured to yoke 25. The axis of yoke 25 is extended by a stem 29, to the end of which is secured an operating-handle 30, the said handle being placed at any desired distance from the speed- 10o stress upon the two friction-wheels balancing the entire transmitting mechanism between the two disks and any movement of the spider being prevented by supporting the outer end of stem 29. Disk 10 is continually urged toward disk 5 and a proper engagement had between said disks and the friction-wheels by means ofthe spring 15, the force of which may be increased or diminished by an adjustment of nut 19.

Itis to be noticed that the mechanism described is entirely self-contained. It may be removed bodily from the driven shaft or .attached thereto without in any manner disshaft.

turbing its adjustment and without manipulationof a number of parts, the tightening or loosening of set-screw 31 being sufficient to attach or detach the device from the driven By this means I have been enabled to produce a device especially applicable for attachment to throttling-governors.

The bearings 24 and 24' are preferably of the removable-cap form, so that by adjust- :fing their fastening-bolts 32 the trunnions of the yokes 25 and 25 may be clamped with sufficient force to normally hold the frictionwheels in any position of angular adjustment in which they may be placed by swinging the For the sake of convenience the disk 5 will be hereinafter called the driven disk and vthe disk 10 will be called the driving-disk.

It will be readily apparent that my device "may be used wherever a variation of speed between the driving and driven mechanism is required; but the device is primarily designed not for the transmission of large powers, but rather for the mere variation of f speed. Special description of the operation therefore will be limited to a discussion of this use in connection with governors, although the device is not necessarily limited to such use.

Inuse with a throttling-governor the device is slipped upon the shaft 8 and disk 5 secured thereto, so as to rotate therewith, by means of the set-screw 31. The usual driving-belt is then placed upon pulley 12. Suppose now irthat the governor be arranged to normally limit the speed of the engine to two hundred revolutions per minute, pulley 12 for that purpose being driven from a pulley twice its diameter. Friction-wheels 6 would then be placed parallel tothe shaft 8, and disk 5 would be driven at the same speed as the disk 10. Suppose now that it is desired to allow the engine to run at an increased speed.. In order to obtain the best efficiency of the governor, the governor-balls should rotate at the normal speed, which in the present case is four hundred revolutions per minute. The operator will therefore grasp handle 30 and by turning it to the left, Figs. 1 and 4t, the friction-wheels 26 and 26 are turned bodily about their external axes at right angles to their own axes, so as to bring their peripheries closer to the center of disk 10 and farther away from the center of disk 5. By this means the disk 10 can be rotated at a greater speed, while disk 5 will be rotated at the original and most efficient speed. In case it is desired to run the engine slower-than the normal speed of operation the friction-wheels are turned bodily to the right about their external axes, so as to bring their peripheries nearer the center of disk 5 and farther away from the center of the disk 10. By this means the governor will always be made to rotate at its normal and most efficient speed, so that it will give the most efficient operation of the throttling-valve.

For the sake of convenience of the operator the, two segments 28 and 28 should be marked at their meshing surfaces with corresponding marks, such as the letters shown in Fig. 4,-, to indicate to the operator the position for any desired speed of the engine. In order to prevent too great a movement of the segments, the cap of one of bearings 24 is shortened and a radial pin 33 secured to one trunnion of the yoke 25 in position to engage the other half of the bearing.

I claim as my invention- 1. In a speed-Varying mechanism, a driven disk, a driving-disk, a .friction-wheel mounted between and cooperating with said disks, means arranged about the axis of the disks for supporting said friction-wheel upon an externalv axis at an angle to its own axis and the axis of the disks, and means for swinging said friction-wheel upon its external axis.

2. In a speed-Varying mechanism, a driven disk, a driving-disk, a pair of friction-wheels mounted between said disks upon opposite `sides of the axis thereof, means arranged about the axis of said disks for supporting vsaid friction-wheels each upon an external axis at an angle to its own axis and the axis of the disks, and intermediate connections between said friction-wheels for swinging them simultaneously in opposite directions upon their external axes.

3. In a speed-varying mechanism, a driven disk adapted to receive and be secured to a.

driven shaft, a driving-disk, intermediate connections between said disks allowing a relative rotation but normally preventing a separation, a friction wheel mounted between and co peratin g with said disks, means supportedupon the connection between the ldisksfo'r su pporting said friction-wheel upon an external axis at an angle to its own axis IOO IIO

1 130 t y disk, revolubly mounted upon said sleeve, a y, supporting-spider pivotally mounted about said sleeve, apair of friction-wheels sup-` R 35 I 1 ternal axis at au angle to its own axis and to ,g theaxis of the disks, and intermediate connections betweensaid friction-wheels for swinging them simultaneously in opposite diandthe axis of the disks, and means for lswi'nging said friction-wheel upon its external axis. y

l 4. Ina speed-varying mechanism, a driven `disk adapted to receive and be secured to a driven shaft, a :driving-disk, intermediate connections between said `disks allowing a tion between said disks for supporting said friction-wheels each upon an external axis at u `an angle to its own axis and the axis of the disks, and intermediate connections between said friction-wheels for swinging them simultaneously in opposite directions upon their external axes. i 5. In a speed-varying mechanism, a driven disk `provided with an axial sleeve, a drivingdisk revolubly mounted upon said sleeve, a

w f "axis and theaxis of the disks, and means for swinging said friction-wheel upon its exter- `nal axis. j

1 Y 6. In speed-varying mechanism,a driven i l` ,l friction-wheel mounted between and coperating with said disks, means supported upon said sleeve for supporting said friction-wheel upon an external axis at an angle to its own disk provided with an axial sleeve, a drivingported upon said spider upon opposite sides of the axis of the disks and each upon an exrections upon their external axes.

7. A speed-varying pulleyT consisting of the following elements; a driven disk provided with an axial sleeve, a driving-disk revolubly mounted upon said sleeve, a pulley carried by said driving-disk, a support pivotally mounted about said sleeve between the disks,

` a friction-wheel mounted` upon said support upon an external axis at an angle to its own axis and tothe axis of the disks, and means for swinging said friction-wheel upon its external axis.

8. A speed-varyi ng pulley consisting of the `iyfollowing parts, a driven disk provided with an axial sleeve, a driving disk .revolubly mounted upon said sleeve, a pulley carried i by said driving-disk, a supporting-spider piv- 1 otally mounted about said sleeve, a pair of `friction wheels mounted upon said spider l each upon an external axis at an angle to its ownaxis and the axis of the disks, and interl .i mediate connections between said frictionwheels for swinging them simultaneously in opposite directionsupon their external axes.

9. A speed-varying pulley consisting of the i following parts; a driven disk provided with an axial sleeve, a driving disk revolubly friction-wheels for swinging them simultanes ously in opposite directions upon their externalaxes.

10. A self-contained speed-varying pulley consisting of a driving element and a driven element, one supported upon the other and revoluble thereon, intermediate gearing supported upon and between said elements and forming a driving connection therebetween, and means for shifting said intermediate gearing with relation to the driving and driven elements.

11. A self-contained speed-varying pulley, consisting of a driving element and a driven element, one supported upon the other and revolubly mounted thereon and one of said elements being adapted to receive a shaft, an intermediate gearing supported upon and be-A tween said element's and forming a driving connection therebetweemand means for shitting said intermediate gearing with relation to the driving and driven elements. y

12. The combination with a governor, of a driven disk adapted to receive and be secured to the driving-shaft of said governor, a driving-disk, connections between said disks allowing a relative rotation thereof but'normally preventing a separation, a frictionwheel mounted between said disks upon an external axis at an angle to its own axis` and the axis of the disks, and means for swinging said friction-wheel about its external axis.

13. The combination with a governor, of a driven disk provided with an external sleeve adapted to receive and be secured to the driv-` ing-shaft of said governor, a driving-disk rev-V olubly mounted on said sleeve, a driving--pul-V ley carried by said driving disk, a spider mounted between said disks and pivoted about said sleeve,a pair of friction-wheels carried by said spider each upon an external axis at an angle to its own axis and the axis of the disks, and means for swinging said friction-wheels simultaneouslyin opposite directions about their external axes.

14. A speed-varying pulley consisting of the following parts; a driven disk provided with an axial sleeve, a driving-disk revolubly mounted thereon, a spider mounted between said disks and pivoted about said sleeve, two pairs of oppositely-extending arms forming part of said spider, a yoke pivotally mounted between each pair of arms, a friction-wheel carried by each of said yokes in position to coperate with said disks, and intermediate connections between said yokes for simulta- 4 neously swinging them inopposite directions about their axes.

l5. Aspeed-varyingpnlley consisting of the following parts, a driven disk provided with an axial sleeve, a driving disk revolubly mounted thereon, a spring for yieldingly urging said disks together, a spider mounted, between said disks and pivoted about ysaid.

sleeve, two pairs of oppositely-extending arms forming part of said spider, a yoke pivotally mounted between each pair of arms, a fric? tion-wheel carried by each of said yokes in position to cooperate with said disks, and intermediate connections between said yokes for simultaneously swinging them in opposite directions about their axes.

v16. The combination with a governor and the driving-shaft thereof, of :itself-contained speed-varying pulley consisting of a driving element and a driven elementone supported upon the other and revoluble thereon, means carried by the driven element for attachmentv to said driving-shaft, intermediate gearing supported upon and between said elements and forming a driving connection therebetween, and means for shifting said intermediate gearing with relation to the driving and driven elements.

. FRED W. SPACKE.

AVVitnesses:

yARTHUR M. HOOD, BERTHA M. BALLARD. 

